var goto_top_type = -1;
var goto_top_itv = 0;

function goto_top_timer(){
	var y = goto_top_type == 1 ? document.documentElement.scrollTop : document.body.scrollTop;
	//alert(y);
	var moveby = 15; // set this to control scroll seed. minimum is fast
	y -= Math.ceil(y * moveby / 100);
	if (y < 0) 
		y = 0;
	
	if (goto_top_type == 1) 
		document.documentElement.scrollTop = y;
	else 
		document.body.scrollTop = y;
	
	if (y == 0) {
		clearInterval(goto_top_itv);
		goto_top_itv = 0;
	}
}
function goto_top(){
	if (goto_top_itv == 0) {
		if (document.documentElement && document.documentElement.scrollTop) 
			goto_top_type = 1;
		else 
			if (document.body && document.body.scrollTop) 
				goto_top_type = 2;
			else 
				goto_top_type = 0;
		
		if (goto_top_type > 0) 
			goto_top_itv = setInterval('goto_top_timer()', 25);
	}
}